I also have the book "In Persuit of Gaint Bass". Shure he is right, BUT. Most of us do not have barometers to confirm, but we know the fishing is good on the front side of a front. So the fornt on the five day forcast gives us an idea on when to go. And if you reed the book you will see he is a deep water structure fishermanm, which most people are not. I love top water, and I try to go out on the day on the front hoping it will hit late and be overcast all day. I have considerable luck on northern strain bass from march on. I have even done better than everybody on the lake with a buzz bait on the day after a front( a few times). And the dark condition and wind can be just what the doctor ordered for shallow Florida strain bass that are warry early spring. It brings them into ambush possitions and makes it almost impossible to see the line or you. The moon phases are true but are by no means the only time fish bite. Look at Rob big catch from Coyote and you will find that Time wise, the early bites he got were not in any majior acivity period and the large fish he caught was dead in the middle of the second activity period, which the book says the big ones should only bite during the last 15 min.
I did not check the moon phase on that. These are just generalizations to go by. And are not always dependable.